A black gel pen with pigment-based security ink is the best defense against check washing — the ink soaks into paper fibers instead of sitting on top of them.
Check washing erases the payee name and amount on a written check, letting a thief rewrite it. The defense starts before you ever put the check in the mail: a black security gel pen makes the ink chemically inseparable from the paper. According to the Michigan Attorney General’s consumer alert, black gel ink contains pigments that permeate the check’s fibers, making it the best available protection against this type of fraud.
Why Gel Ink Resists Check Washing Better Than Ballpoint
Standard ballpoint ink sits on the surface of a check, which is exactly why it can be removed. Michigan’s consumer alert states that the blue ballpoint ink most people keep on hand is easily lifted with acetone — a solvent available at any hardware store. Gel ink works differently. Its pigment particles absorb into the paper’s structure, so removing them means destroying the check itself.
That structural difference is the whole game. Orbograph’s check washing experiment tested multiple pen types against real washing methods and confirmed that gel formulations hold up where ballpoint ink fails. Norton LifeLock’s fraud resource adds that permanent or gel inks are consistently favored over standard ballpoints for the same reason: the ink becomes part of the paper rather than a film on top of it.
What to Look For on the Packaging
Not every gel pen is a security pen. The label needs to say so explicitly. Look for pens marked security, anti-fraud, super ink, permanent, or indelible — vague gel claims aren’t enough. Among labeled options, black is the color to buy.
- QuickBooks Super Ink Security Pen — same Uni Super Ink technology, explicitly marketed as preventing check washing and alterations.
Notice a pattern: the pens that state a real anti-fraud standard are also the pens that restrict themselves to black ink. That’s not branding. Black pigment is harder to strip from paper fibers than dye-based colors, which is why blue is the classic mistake. Pen manufacturers can also change formulas between production runs, so verify the current claim on the product page before buying if the exact protection level matters to you.
| Pen Feature | Protection Level | What to Buy |
|---|---|---|
| Black gel ink | High — pigments absorb into paper | Yes — the best baseline choice |
| Anti-fraud / security pen label | Highest — tested against solvents | Yes — look for this claim |
| Blue gel ink | Moderate | Avoid if black is available |
| Standard blue ballpoint | Low — removed with acetone | Never for checks |
| Unlabeled gel pen | Unknown | Verify a permanent or security claim first |
| Pencil or erasable pen | None | Never for negotiable documents |
How to Write the Check Itself
Pen choice is half the job. Leaving blank space in the payee or amount fields gives a thief somewhere to write, even with ink that’s hard to remove. Fill every line completely so there’s no gap to fill in later.
- Use black security gel ink on every check you write.
- Write the payee name fully, all the way across the line.
- Write the numeric amount tightly, with a leading “$” close to the first digit.
- Write the written-out amount across the full line, drawing a line through leftover space.
- Never sign a blank check or leave the payee field open.
The Michigan consumer alert and Norton LifeLock both reinforce the same advice: the combination of proper ink and filled-out fields is what makes a check genuinely hard to alter. A perfect pen on a half-blank check doesn’t protect you. If you’re ready to compare specific pens side by side, our tested roundup of check-washing-resistant pens covers the top models with their exact ink specifications.
Common Mistakes to Avoid
The most frequent error is assuming any ballpoint is secure. It isn’t — ballpoint ink sits on the surface and can be chemically removed, which is why the pens in your junk drawer are the wrong tool for this job. The second mistake is assuming any gel pen will do. Consumer guidance is consistent here: the product must explicitly claim security, permanence, or anti-fraud protection. If the packaging doesn’t say it, the pen doesn’t have it.
The third mistake is using blue ink out of habit when a black security option is sitting right next to it. Michigan’s alert is blunt about this: blue ballpoint ink is the easy target.
Common Questions
Is a regular black gel pen good enough, or do I need a “security” pen?
A regular black gel pen is a solid baseline choice because pigment-based gel ink absorbs into paper fibers. But if you want the strongest protection, look for a pen that explicitly claims security, anti-fraud, or permanence on its packaging. Unlabeled gel pens vary widely in formulation, and the ones tested against solvents carry the most credible protection claims.
Why is black better than blue for check writing?
Black pigment is harder to remove from paper fibers than dye-based blue ink. Michigan’s consumer alert specifically points to black gel ink as the best protection against check washing, and the security pen lines that meet formal anti-fraud standards restrict themselves to black ink for this reason. Blue ballpoint, in particular, can be lifted with acetone.
Does using a security pen mean I don’t need to worry about check fraud?
No. A security pen makes alteration harder, but it doesn’t change bank rules or eliminate fraud risk. The protective effect depends on using the right ink, filling out every field completely, and watching your account for unauthorized activity. Ink choice is one layer of protection, not the whole picture.
Sources
- Michigan Department of Attorney General. “Check Washing” States black gel ink provides the best protection against check washing and that blue ballpoint ink is easily removed with acetone.
- Orbograph. “Check Washing Experiment: Putting Gel Ink Pens to the Test” Tests multiple pen types against real check washing methods to compare ink resistance.
- Norton LifeLock. “What Is Check Washing and How Can You Prevent It?” Explains how check washing works and which ink types offer better protection.